drivers/media/radio/radio-sf16fmr2.c

   1 /* SF16-FMR2 radio driver for Linux
   2  * Copyright (c) 2011 Ondrej Zary
   3  *
   4  * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   5  * but almost nothing remained here after conversion to generic TEA575x
   6  * implementation
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/module.h>       /* Modules                      */
  11 #include <linux/init.h>         /* Initdata                     */
  12 #include <linux/slab.h>
  13 #include <linux/ioport.h>       /* request_region               */
  14 #include <linux/io.h>           /* outb, outb_p                 */
  15 #include <linux/isa.h>
  16 #include <sound/tea575x-tuner.h>
  17
  18 MODULE_AUTHOR("Ondrej Zary");
  19 MODULE_DESCRIPTION("MediaForte SF16-FMR2 FM radio card driver");
  20 MODULE_LICENSE("GPL");
  21
  22 static int radio_nr = -1;
  23 module_param(radio_nr, int, 0444);
  24 MODULE_PARM_DESC(radio_nr, "Radio device number");
  25
  26 struct fmr2 {
  27         int io;
  28         struct v4l2_device v4l2_dev;
  29         struct snd_tea575x tea;
  30         struct v4l2_ctrl *volume;
  31         struct v4l2_ctrl *balance;
  32 };
  33
  34 /* the port is hardwired so no need to support multiple cards */
  35 #define FMR2_PORT       0x384
  36
  37 /* TEA575x tuner pins */
  38 #define STR_DATA        (1 << 0)
  39 #define STR_CLK         (1 << 1)
  40 #define STR_WREN        (1 << 2)
  41 #define STR_MOST        (1 << 3)
  42 /* PT2254A/TC9154A volume control pins */
  43 #define PT_ST           (1 << 4)
  44 #define PT_CK           (1 << 5)
  45 #define PT_DATA         (1 << 6)
  46 /* volume control presence pin */
  47 #define FMR2_HASVOL     (1 << 7)
  48
  49 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
  50 {
  51         struct fmr2 *fmr2 = tea->private_data;
  52         u8 bits = 0;
  53
  54         bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
  55         bits |= (pins & TEA575X_CLK)  ? STR_CLK  : 0;
  56         /* WRITE_ENABLE is inverted, DATA must be high during read */
  57         bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
  58
  59         outb(bits, fmr2->io);
  60 }
  61
  62 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
  63 {
  64         struct fmr2 *fmr2 = tea->private_data;
  65         u8 bits = inb(fmr2->io);
  66
  67         return  (bits & STR_DATA) ? TEA575X_DATA : 0 |
  68                 (bits & STR_MOST) ? TEA575X_MOST : 0;
  69 }
  70
  71 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
  72 {
  73 }
  74
  75 static struct snd_tea575x_ops fmr2_tea_ops = {
  76         .set_pins = fmr2_tea575x_set_pins,
  77         .get_pins = fmr2_tea575x_get_pins,
  78         .set_direction = fmr2_tea575x_set_direction,
  79 };
  80
  81 /* TC9154A/PT2254A volume control */
  82
  83 /* 18-bit shift register bit definitions */
  84 #define TC9154A_ATT_MAJ_0DB     (1 << 0)
  85 #define TC9154A_ATT_MAJ_10DB    (1 << 1)
  86 #define TC9154A_ATT_MAJ_20DB    (1 << 2)
  87 #define TC9154A_ATT_MAJ_30DB    (1 << 3)
  88 #define TC9154A_ATT_MAJ_40DB    (1 << 4)
  89 #define TC9154A_ATT_MAJ_50DB    (1 << 5)
  90 #define TC9154A_ATT_MAJ_60DB    (1 << 6)
  91
  92 #define TC9154A_ATT_MIN_0DB     (1 << 7)
  93 #define TC9154A_ATT_MIN_2DB     (1 << 8)
  94 #define TC9154A_ATT_MIN_4DB     (1 << 9)
  95 #define TC9154A_ATT_MIN_6DB     (1 << 10)
  96 #define TC9154A_ATT_MIN_8DB     (1 << 11)
  97 /* bit 12 is ignored */
  98 #define TC9154A_CHANNEL_LEFT    (1 << 13)
  99 #define TC9154A_CHANNEL_RIGHT   (1 << 14)
 100 /* bits 15, 16, 17 must be 0 */
 101
 102 #define TC9154A_ATT_MAJ(x)      (1 << x)
 103 #define TC9154A_ATT_MIN(x)      (1 << (7 + x))
 104
 105 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
 106 {
 107         if (!fmr2->tea.mute)
 108                 pins |= STR_WREN;
 109
 110         outb(pins, fmr2->io);
 111 }
 112
 113 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
 114 {
 115         int i;
 116         u32 reg;
 117         u8 bit;
 118
 119         reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
 120         reg |= channel;
 121         /* write 18-bit shift register, LSB first */
 122         for (i = 0; i < 18; i++) {
 123                 bit = reg & (1 << i) ? PT_DATA : 0;
 124                 tc9154a_set_pins(fmr2, bit);
 125                 udelay(5);
 126                 tc9154a_set_pins(fmr2, bit | PT_CK);
 127                 udelay(5);
 128                 tc9154a_set_pins(fmr2, bit);
 129         }
 130
 131         /* latch register data */
 132         udelay(5);
 133         tc9154a_set_pins(fmr2, PT_ST);
 134         udelay(5);
 135         tc9154a_set_pins(fmr2, 0);
 136 }
 137
 138 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
 139 {
 140         struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
 141         struct fmr2 *fmr2 = tea->private_data;
 142         int volume, balance, left, right;
 143
 144         switch (ctrl->id) {
 145         case V4L2_CID_AUDIO_VOLUME:
 146                 volume = ctrl->val;
 147                 balance = fmr2->balance->cur.val;
 148                 break;
 149         case V4L2_CID_AUDIO_BALANCE:
 150                 balance = ctrl->val;
 151                 volume = fmr2->volume->cur.val;
 152                 break;
 153         default:
 154                 return -EINVAL;
 155         }
 156
 157         left = right = volume;
 158         if (balance < 0)
 159                 right = max(0, right + balance);
 160         if (balance > 0)
 161                 left = max(0, left - balance);
 162
 163         tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
 164         tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
 165
 166         return 0;
 167 }
 168
 169 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
 170         .s_ctrl = fmr2_s_ctrl,
 171 };
 172
 173 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
 174 {
 175         struct fmr2 *fmr2 = tea->private_data;
 176
 177         if (inb(fmr2->io) & FMR2_HASVOL) {
 178                 fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
 179                 fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
 180                 if (tea->ctrl_handler.error) {
 181                         printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
 182                         return tea->ctrl_handler.error;
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int __devinit fmr2_probe(struct device *pdev, unsigned int dev)
 190 {
 191         struct fmr2 *fmr2;
 192         int err;
 193
 194         fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
 195         if (fmr2 == NULL)
 196                 return -ENOMEM;
 197
 198         strlcpy(fmr2->v4l2_dev.name, dev_name(pdev),
 199                         sizeof(fmr2->v4l2_dev.name));
 200         fmr2->io = FMR2_PORT;
 201
 202         if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
 203                 printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
 204                 kfree(fmr2);
 205                 return -EBUSY;
 206         }
 207
 208         dev_set_drvdata(pdev, fmr2);
 209         err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
 210         if (err < 0) {
 211                 v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
 212                 release_region(fmr2->io, 2);
 213                 kfree(fmr2);
 214                 return err;
 215         }
 216         fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
 217         fmr2->tea.private_data = fmr2;
 218         fmr2->tea.radio_nr = radio_nr;
 219         fmr2->tea.ops = &fmr2_tea_ops;
 220         fmr2->tea.ext_init = fmr2_tea_ext_init;
 221         strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card));
 222         snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "ISA:%s",
 223                         fmr2->v4l2_dev.name);
 224
 225         if (snd_tea575x_init(&fmr2->tea)) {
 226                 printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
 227                 release_region(fmr2->io, 2);
 228                 kfree(fmr2);
 229                 return -ENODEV;
 230         }
 231
 232         printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io);
 233         return 0;
 234 }
 235
 236 static int __exit fmr2_remove(struct device *pdev, unsigned int dev)
 237 {
 238         struct fmr2 *fmr2 = dev_get_drvdata(pdev);
 239
 240         snd_tea575x_exit(&fmr2->tea);
 241         release_region(fmr2->io, 2);
 242         v4l2_device_unregister(&fmr2->v4l2_dev);
 243         kfree(fmr2);
 244         return 0;
 245 }
 246
 247 struct isa_driver fmr2_driver = {
 248         .probe          = fmr2_probe,
 249         .remove         = fmr2_remove,
 250         .driver         = {
 251                 .name   = "radio-sf16fmr2",
 252         },
 253 };
 254
 255 static int __init fmr2_init(void)
 256 {
 257         return isa_register_driver(&fmr2_driver, 1);
 258 }
 259
 260 static void __exit fmr2_exit(void)
 261 {
 262         isa_unregister_driver(&fmr2_driver);
 263 }
 264
 265 module_init(fmr2_init);
 266 module_exit(fmr2_exit);